Thanks for printing! don't forget to come back to delta plumbing for fresh articles! Unfortunately, there are some downsides to the compact convenience of the combi boiler, and in some cases, it may not be the most effective choice for heating your home. Commonly, the hydro-jet cleans stubborn drain blockages far better than the electric eel drain machines and is often used for more serious blockages. Looking for heating cover to protect your boiler and heating system? use.